Here’s a better tip: use a hyphen, as in [perl-6]. Google interprets hyphens in terms as optional and interchangable with a blank, so this gives you the results of both [perl6] and ["perl 6"]. (But Google already treats whitespace between a word and a number as partially insigificant, so you get largely the same set of results whichever the query you used. The only noticable difference is ranking – things that show up low in the results for both other queries drop even lower in the results for [perl-6].)